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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65437b9b49f288f425780394781dccad103593c574515c4c99fa646bf7ac8002' 
  AND token = 'y92FSMLS+AXDLY4SDV68WzzF7KYfeywea7FbIO/XS7g=' 
  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"
    }
  }
}