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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42626b3298d87b704afabce013b57c8274bb35604effc0b0ff58e84702ebd95d' 
  AND token = '9KPH3z76/FQ1Yfp/FCohEcABRYNQg3kH+hIc2y+20Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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