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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445973f7300a9aa257bca641ef15bb60118e8c3165f3519a19d0cb985cec0c40' 
  AND token = 'Szxv1A47NSvG/BCUlyJux3X31KoNs3TTlh1NACMNBPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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