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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19526a8e7a97a709ec14b2bc5e58542568a15d6586d0379d87162910b00bc93' 
  AND token = 'DemQzmiKJh5x8LtqaKzjNFhpvNmjoe46jAiuD6OpdwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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