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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a100bec26086ab08c4330237f2bee6e23ec459cf4d88fa05aa7f2ed830f139' 
  AND token = 'ZxMwvwz1ybbU+2mHHln2K4zPJwRe8257yJ6B46UThAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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