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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2011858d3ee7ac6bf90a0a147fefd4d4be7b839a2ad313f21d4fef706647df99' 
  AND token = 'Mcf6NamEed6cVjaIq8A/voCZ/PWEptuv43xI3Juv54M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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