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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e6cf5ec3d324a46b46502c3ef41b92ebb2fd4f6ea1b6fefa806873f9e946d5' 
  AND token = '4XyrjQpeMZO2rlccMSth5PLpWAVj4hGJL4/RA4dSKQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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