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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deba33ff8af5d4abde9f44eb11c550b1bc26d3b2ee30f1d7c3da9d20b2be5e1b' 
  AND token = 'q4JQj4hTvDcDy9xqK5bwW9Riz+vdvmSNGFoWhUgMvgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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