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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37e550afdcb0e886f286786d3feeb5559fc58b0749ae9c4c8639ff2c752ba39' 
  AND token = 's6JdpITzCUtXnBf4/uXWQst8UnB7QqXbeH/f5uHkcQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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