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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01984758b1279ee3fa2ae0acb12575d581754d4fead6375fa08082f811c9dacc' 
  AND token = '+xRllrHABpgHhtx7Ia8GtuYgbGW3ERQ6yb1APlhaK4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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