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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf195c7277e2e22060e14d14243137c23dd69c8e0d7f2ae49a8b4cecac04f71a' 
  AND token = 'B4gNdna5Q9jYZ9mhgMu5Y0Lok5r8aIIikuQdpQkujHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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