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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b805fa93729f69093300d97533bcc0f255ca809c1c2873af09a655ab68b4d1b5' 
  AND token = '9fUAcA8a2QJOhKEHXrJN/2RJMI7dm1cD0O3cPPVe1pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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