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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f092bb9f9af3a0c6c9d7846f4d4d99c9d42636ee42820f6aa4f91d939f0f03e0' 
  AND token = 'A66KHkzSoHxhlerlRFByLrjPlwvfnbtAJ+2A7w0Vf3o=' 
  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"
    }
  }
}