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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a3bbc63ea73c8ccecf58b915532e39964da721b08919f45392e949fa8295bd' 
  AND token = '2klmjr4yaa7TSTvKBcl1+9I4Gl4S5HwIEPePxNZgs0c=' 
  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"
    }
  }
}