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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcf099229f85101be67489e5265ae6dfa23817e72c04d8b6624d89a4d171605' 
  AND token = 'v+iMjlG+/wlH+NL/4fd2/4udxub4hiNevpq76gcl3Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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