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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a736dcbd405142c76de815917a5e3d243edcdbb16b2ddfaf15fc2b518633ca' 
  AND token = 'Vsd7eYviGQ6Aoq+V7HMFuw8s/y8f2QsUw6cAfXcl0Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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