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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf3d41b403016cc30f040e8fe32f297cfe75b211df0a99f2e7c9d2c90c0e7f0' 
  AND token = '9c2itOPaFHCGZgNGduXh3ULgt0UvLlU0sOst8OvNT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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