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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec427015ec33a3c5e6011a206e0b0db1f3eca2b958dc9697f59e792cb1d9fe1' 
  AND token = 'boLHGcjZfdrQMjGhtetU+qfgBcL4eKPo+EVNVI9l6oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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