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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d3cc537b2793363344d20e08d5118c931369407101ffa863eb9e2a199fcadd' 
  AND token = 'TE65tPUrMH7n+Es6voh89wfIKEUic6Mem2zsyveAUXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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