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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd360d79bb7c30974057e86d6a7db14c1432782e8b9c4630fc43ce721fd0075e3' 
  AND token = '90WuJI4Wqx9HoPwZ11rNE1x+efpz5dZ33IU4pR03+GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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