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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b016fb1fcc8ec90e2c447e682f8099c77c94e04bfd79d944e2f7c6084d684e6' 
  AND token = 'JMJnJCMlfX1aQUBCHCmQ9GWRuu2B6+cMzazQwumrDI0=' 
  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"
    }
  }
}