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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd7e896c967552cd56967c6e872917a00e1d3041d08598a83824ab1635a5692' 
  AND token = 'VfXe27i13JKle1Gek15PM4ct1/JlIEZVL9TOY5TrN3A=' 
  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"
    }
  }
}