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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f20e5fe9ed02e5b30caa7e0e885aa372a6760a3071c01f99b4b5d71e9876c49' 
  AND token = '+KdJB+DkMRZv6nVWLCnDIplUv2c99gFhOO2H6r48A3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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