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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7122f32ee5a1f7a470dadf692372326a8e60047d7d5eef6fac507db0f763312b' 
  AND token = 'JNabIkJ9x9rgJeiYTH1EeiIVCDXKvKKvrt6W1uJxje4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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