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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9719797dbab1c08656028b33e7dd7b88f1bff894195e3d620775b6af1c76a44' 
  AND token = 'IsJreUQ0Hl9x9KF8f/59HeQrOx0HrgGjGe/DNOJvts8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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