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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0558a2a11317e4b2f9f4bbc2737f293ac1f9bf53cae1ea2fb41caa0fed104d74' 
  AND token = 'wXVVe0OwAC0dTlPFq/S4tIRpAaN4OOpsZkH+2h4eMqI=' 
  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"
    }
  }
}