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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d6f552297a736a5f270ed44c15ba439a7ce5cdcc8c0122d5bf84f2a1d9bac3' 
  AND token = '9pRBxphT0mw5vjfhEO0vs2AZXCoFtt8gjnvqB3LAeGo=' 
  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"
    }
  }
}