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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d6f502a7ae9c64e09517fef60081a41b83c826cc4c865c18a4424cbd64e144' 
  AND token = 'z6ourXaYz9Kf0rAOcZnd9Md+BzEqDTBqX7GFPBvK4fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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