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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073fef677f3e7fa5331832758eb7ffafcefdddb7e1c222d20b4b76b4eb48bcbc' 
  AND token = 'RHXgdE0NDZRFb8K2GqgIdo906nTlr5ef/aTt9/TM7Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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