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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da01ef39d3ac2117de91b33d2b570d1ab86250e0198b7d984d217215e6a65b49' 
  AND token = '6fXzFUMqfVsf7Rrj9FA7OID5uV87FNP1cuJjgOfmYhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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