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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c414ec1e1bc4861c0cb6eba4d931af91cc0d664585f3e81a811fffb2cc0540a1' 
  AND token = 'Y/LUXCG8G+w7cPYY7Tzt0Aup3kI/Z7jl05fy88D4DuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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