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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82ee57e1294f5efbe2c12e811977bb42f47058275d97f7c7ad35dcdde8ab8ee' 
  AND token = 'FhrgGlP8HqqzAT99vIlMwqwNz7c97SHeHIk+1IyRP08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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