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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7b61d165dad639471ec820f0408346c1e7abcbc1e198e6b2826828568b200d' 
  AND token = '40fZz2YnVsbAHeCtDjWTZpLGFaRtYGPezMBB3YH4BKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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