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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054d2d1d426808b1d4659b4639eb9e263910bd00ba62366ef9ea3842ffaabcbb' 
  AND token = '10/Qov7k2rrEtjmmywZMJiFGT55S0W8S6EGsQXxiWeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}