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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835cad013033228a2f0042f05e892544894c48cf998b5e0b2b5095d1fded6fdd' 
  AND token = '7PA8JBfEummFnLv9KH42o5wIkdHjmBc/xFMel0T1u2k=' 
  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"
    }
  }
}