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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d877286c714bcdb057f9a78bd037eaa52b64e6b4cde42a87b92a54f190e97e0' 
  AND token = 'y8KiEALeNZ/5Dz6t/sGO+r60HrflDRM5fR6xEb+Q00g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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