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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb87ba766e0dcd958599554fd03877b1ab377c52dab8b1873d0446dd763ba24' 
  AND token = 'bueDUKS8wTJ6NqZtloxdMz0zgLiF6bQ+TK19zhKrTTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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