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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad1c81dc97285c1cc62632cd8d2020f3c1bfc7760233abe04df51b3897c5c8e' 
  AND token = '+OqJ0EscIJSGFKW2U7D8qD2xs3rK6TRc+MpHnVbFghE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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