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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa4e8b3e58079c70634dfecf11c2972289a7915dc60635f6383af51c243e5c3' 
  AND token = '93mP2nE3jeinEwPT2Qa+icOir78SXLcjJJkZn+Tn1Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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